Steam ore-stamp



No. 608,422. Patented Aug. 2, I898.

n. sous.

STEAM ORE STAMP.

(Application filed Kay 8, 1897.)

(No Model.)

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UNITED STATES PAT NT rrrcn.

THE GATES IRON STEAM ORE-STAM P.

SPECIFICATIONforming part of Letters Patent No. 608,422, dated August 2,1898.

7 Application filed May 3, 1897. Serial No. 634,873. (N0 dem To all whomit may concern.-

Be it known that I, DAVID COLE, a citizen of the United States,residing'at Chicago, in

the county of Cook and State of Illinois, have invented certain new anduseful Improvements in Steam Ore-Stamps, of which the following is aspecification. I

The object of my invention is to provide a simple, economical, andefficient ore-stamp; and the invention consists in the features,combinations, and details of construction hereinafter described andclaimed.

In the accompanying drawings, Figure l is a longitudinal sectionalelevation of the upper portion of a steam ore-stamp constructed inaccordance with my improvements, preferably showing the ports andpassages for the admission of fluid-pressure in diagrammatic form; andFig. 2, a modified'form of my, improvement', showing the same as appliedto a single cylinder and stamp-piston. 7

My invention relates particularly to that class of steam ore-stamps inwhich a battery,

consisting of two cylinders and stamp-pistons, is arranged to becontrolled by the operation of a single valve. In this particular it isusual to use the controlling-valve to admit and exhaust thefluid-pressure; and my invention has for its principal object theproviding of a controlling-valve to govern the admission of the fluidpressure only while the stamp piston or pistons in their operationcontrol the exhaust directly without the intervention of other means.

Other objects of the invention will appear from the followingdescription and an eXaInination of the drawings.

In illustrating and describing my improvements I will only illustrateand describe those parts which I consider to be new, taken in connectionwith so much that is old as will enable those skilled in the art tounderstand the same and practice the invention, leaving out ofconsideration other and well-known mechanisms which if described herewould only tend to confusion and ambiguity.

In describing a steam stamp-mill constructed in accordance with myimprovements I will first describe one form to which my improvements areapplicable-viz. a mill comprising a battery of two cylinders havingmovable stamp-pistons therein, as shownpartieularly in Fig. 1. In thisform a casing A is provided having two cylindrical pressure-chambers aa, in which stamp-pistons B and B are reciprocatingly mounted, suchstamp-pistons being provided with the usual stems Z) Z), to the bottomof which the shoes and other parts are attached. To admit fluid-pressureabove and below such stamp-pistons directly and expansively, I provide asingle controllingvalve (1, having a piston-rod C for moving the same,all of which are mounted in a valvechest 0 This valve piston-rod ispreferably provided with two pistons c and 0, between which the livesteam at high pressure is ad-' mitted, so that such piston-rod ispractically balanced. Each of the valve-pistons is provided with smalllongitudinal openings or passages c and 0 adapted to admit a limitedsupply of fluid-pressure behind such pistons or between them and thevalve-chest casing in opposition to each other, so as to actuate saidrod, as more fully hereinafter described.

To admit fluid -pressure from the valvechest tothe'cylinder, a passage Dis provided, which leadsto the pressure-chamber a below thestamp-piston, and a second passage d, that leads from the valve-chesttothe cylindrical pressure-chamber a above such piston. A passage E leadsfrom the cylinder-chamber cto the valve-chamber in a position to becovered and. uncovered by the movements of the valve-piston'c','wl1ilethe exhaust-passage G connects directly with both of thecylinderchambers and is arranged to be covered and uncovered by themovements of both pistons, as will be more fully hereinafter described.A second passage D connects the valve-chest with the cylinder-chamber aat a point below the stamp-piston located therein, while a piston dconnects such chamber with the valvechamber at a point above thestamp-piston. A passage E also connects the cylindrical chamber a withthe valve-chest and is arranged to be covered and uncovered by themovements of the valve-piston c, as will be hereinafter more fullydescribed.

The operation of the parts is as follows: The valve-piston is arrangedto be moved by a hand lever H first to one side and then to the other.When the valve-piston is moved.

to the position shown in the drawings, high fluid-pressure flows fromthe valve-chest through the passage D below the stamp-piston 13 andraises the same, as shown in Fig. 1. The exhaust is covered, as is alsothe passage E, that leads to the valve-piston chamber. Pressure iiowingthrough the small inlets c and c and acting positively between thepiston c and the walls of the valve-ehamber, such piston and valve aremoved to the opposite position from that shown in the figure, so as toconnect the cylinder-passages D and (Z. l luid-pressure then flowsthrough such passages from below the piston l to above the same, where,acting expansively on the stamp-piston over the large and superflcialarea, it forces the same downwardly, being assisted by the weight of theparts. \Vhile this action is taking place, the passage I) is uncovered,so that high pressure flows below the stamp-piston l3 and acts to raisethe same to its upper limit of motion, covering the cxhaustport and thepassage E. When this passage is covered and the stamp-piston l is at itslowest limitof motion, it will be seen that the pressure between thevalve-piston c and the walls of the casing is allowed to expand orbecome less than between the walls of the casing and the valve-piston cto unbalance the rod and cause such pistons, with the slide-valve, tomove back into the position shown in Fig. 1. At each reciprocation ofthe stamp-piston fluid-pressure is exhausted into the open air throughthe exhaustrpassage G.

Describing the modification shown in Fig. 2, a cylimiler-casing I isprovided in which a single stamp piston K is reciprocatingly mounted. Toadmit high pressure below this piston and expansively above, acontrollingvalve L is mounted in a suitable valve-chest Z. This valve isprovided with a piston-valve rod L, having pistons Z and Z of differentsuperficial areas, while a rod 1 projects through the outer portion ofthe valve-casing and is provided with a eoil-spring l to assist in theoperations and form a cushion for the same. The cylinder casing isprovided with a passage M, that connects the chamber with the valvechestbelow the stamp-piston, and with a second passage N, that connects thevalve-chest with a point above the stamp-piston, both of which arearranged to be connected and disconnected by the movements of the slideor controlling valve. The valve-casing is provided with anescape-passage I, that leads from a point between the valve-piston headI and the val ve-easing to the outer air, though it maybe connected withthe exhaust-passage. A d not or passage 711/ connects the space betweenthe .'alve-piston head I with. the passage 3i for thepurposeshereinaftcrdcseribed.

In operation, the parts being in the position shown in Fig. 2, highpressure is admitted from the valve-chest through the passage M to apoint below the sta1np-piston, causing such piston to rise and close anexhaust-1mm;

i and compressing the low pressure of steam above such ports, so as toact as a cushion and overbalance the direct pressure until the lowerpart of the piston passes above the opening of the passage t" to admitpressure above the piston-head expansively. The prcssu re above thepiston-head being compressed to a point that equals or overbalances thedirect pressure a portion of it is forced through the pas sagcM and theby-pass m to the space between the valve-piston head Z and thevalve-casing, overcoming the direct pressure in the valvechest on thelarger superficial area of such piston and forcing the piston to theother limit of its motion, thereby causing the controlling-valve to moveand connect the passages M and M. \Vhen such passages are connected, thehigh pressure below the stamppiston flows to a point above the same and,acting expansively on the larger superficial. area of the upper portionof the stamp-piston, forces it down to the position shown in the figure.\Vhen such stamp-piston has reached its lower limit of motion, theexhaust-openings are uncovered and the pressure above and below thepiston perm itted to exhaust into the open air. At the same time thepressure which has been compressed between the valve-piston head Z andthe valve-casing is allowed to exhaust, and the direct pressure in thevalve-chest, acting on the larger superficial area of such piston,causes it to move again to the position shown in the figure, therebyadmitting pressure directly beneath the stamp-piston.

The adjustable collar or nut L on the valve rod or stem, taken inconnection with the helical coiled spring Z, acts as a cushion and astension mechanism to properly balance the action of the valve orregulate the same. A pipe 0 is used to connect the valve-chest with somesuitable source of pressure-supply. It will be understood that thepassage t" is a bypass and is not necessary to the complete operation ofthe mechanism, but may be dispensed with or used to suit differentcircum stances or conditions.

\Vhile I have described my invention in two forms in which it may beembodied, and minutely as regards details, I do not desire to be limitedthereto unduly any more than is pointed out in the claims. On thecontrary, I contemplate all proper changes in form, c011- struction,and. arrangement, the omission of parts and substitution of equivalentsas circumstanccs may suggest or necessity ren er expedient.

I claim 1. In a steam ()I'G'Siiiiilj), the combination of a cylinderprovided with a reciprocating stamp-piston, the cylinder having passagesleading to points above and below the stamp piston, a controllingwalvearranged to connect and disconnect the above-named ports and, passagesin the cylinder so as to admit high pressure below he stamp-piston andlow pressure above the same, and a port or IIO passage in the cylindercommunicating with the upper portion of the cylindrical chamber whichforms the low-pressure chamber and so arranged as to be covered by thepiston during the larger portion of its upward stroke and uncovered asthe piston nears the lower limit of its stroke to exhaust the pressureat low pressure, substantially as described.

2. In a steam ore-stamp, the combination of a cylinder provided with areciprocating stamp-piston and inlet and outlet passages, the outlet offluid being controlled by the movements of the reciprocating piston, anda controlling-valve arranged to cover and uncover the passages so thathigh fluid-pressure is admitted below the stamp-piston and low pressureabove the stamp-piston to recipro cate the same, a valve-rod providedwith piston mechanism for moving the controllingvalve, the cylinderbeing provided with passages leading from the cylinder-chamber to suchpiston mechanism and adapted to be covered and uncovered by such pistonmechanism, so that the'movements of the stamppiston causes theoverbalanoing of the valvepiston mechanism and shifts the valve from oneposition to the other, substantially as described.

3. In a steam ore-stamp, the combination of a casing having at least twocylindrical chambers, a stamp-piston in each of such chambers, aValve-chest'having passages connecting with each cylinder above andbelow the stamp-pistons, a controlling-valve adapted to cover anduncover connect and disconnect such passages so as to admit highpressure below the stamp-pistons and expansively above the same toreciprocate the parts, the cylinder-casing having an exhaust-passagethat connects each of the cylinder-chambers with the outer air, theexhaust of fluid through the same being controlled by the movements ofthe reciprocating pistons, a valve pistonrod provided with twopistonsone located 2 DAVID COLE. Witnesses:

PHILETUS W. GATES, W. R. TALBOT.

